For exporters, the incentive to forward-sell dollars has gone down significantly. But this is not a long-term scenario.

The US economy is not that strong to prop up the dollar like this. As a corporate, I don't think we would take any steps on our foreign currency exposures at this volatile juncture, as the rupee has already depreciated," said Prabal Banerjee, CFO, Adani Power.

Many companies have foreign currency loans on their books, either as working capital for foreign operations, or acquisition-related debt.

But CFOs at most large business groups feel despite a depreciating rupee, keeping the benign interest rates in developed markets like the US in mind, it would be better to hold on to foreign

currency debt.

"You get 0-2 per cent interest on dollar debt, compared with 12-14 per cent on rupee debt. The rupee has only depreciated 10 per cent.

"But in this volatile environment, I don't know for how long the advantage would sustain," said an executive director of a leading private sector airline.

Sectorally, a falling rupee is bad news for importers and oil marketing companies, which import their main raw material, crude oil.

With every fall in the rupee, the under-recovery goes up by Rs 9,500 crore per year on these controlled products.

Large metal companies like Tata Steel, Hindalco and Vedanta have foreign currency debt on their books. However, as Sunirmal Talukdar, CFO, Hindalco, points out, "A depreciating rupee is beneficial for us, as the domestic price of aluminum or copper rises.

"Hindalco has repaid a billion dollars of its foreign currency loans taken for the Novelis acquisition.

"The only foreign currency exposure we have is about Rs 3,000 crore (Rs 30 billion) of buyers' credit for the import of copper concentrates. But the exports offer a natural hedge for us."

Tata Motors, like Tata Steel, also has foreign currency exposure.

But analysts don't see much of an impact for the company, as 60 per cent of revenues for Jaguar Land Rover are dollar-denominated and are converted to pounds.

The dollar-pound movement is likely to hit the company more.

The biggest gainers are information technology companies.

A weak rupee means a positive impact of at least three per cent on revenues from India for the top four Indian information technology firms.

Every one per cent change in the rupee-dollar exchange rate has a 40-basis point impact on the margins, and an impact of at least two-3.5 per cent on the net profits of these firms.

Rostow Ravanan, CFO, MindTree, believes the real benefit of the depreciating rupee would only be seen if it remains at this level in the third quarter.